bigger magnets higher kv?

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Hummie
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Joined: 10 May 2016, 04:05
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bigger magnets higher kv?

Postby Hummie » 12 Mar 2018, 04:53

i'll spin up as fast as I can on 15.5 volts in the realtime data and get:




9mm magnets: 7750 erpm divided by 7poles and 15.5v and get..71kv and about 85% magnet coverage


10mm magnets: 8200 erpm divided by 7 poles and 15.5 and get 82kv which has about 96% magnet coverage.


I thought for sure I'd be getting a lower kv with just this switch to bigger magnets. whats going on here?

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.
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Re: bigger magnets higher kv?

Postby rew » 14 Mar 2018, 07:25

The motor has more torque-per-amp. So if the max RPM is limited by amps and the motor has significant drag at those speeds....


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